A
licenseNot graded
qualityC
maintenanceA minimal demo of the x402 payment protocol protecting an MCP tool endpoint, showing how to charge for MCP tools using real 402 rejections and testnet payments.
MIT
x402 endpoint checker
Server Details
Test any x402 paid URL without paying: 402, PAYMENT-REQUIRED, USDC, amounts, payTo, EIP-712, CORS.
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- Status
- Healthy
- Last Tested
- Transport
- Streamable HTTP · MCP 2025-11-25
- URL
TDQS
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Available Tools
1 toolcheck_x402_endpointCheck an x402 endpointRead-onlyIdempotentInspect
Fetch a paid URL without paying and grade its x402 402 challenge: status, PAYMENT-REQUIRED header, version, network, USDC asset, amount units, payTo checksum, EIP-712 domain, CORS, HEAD parity and discovery metadata. Read-only; never signs or pays.
ParametersJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| url | Yes | Full http(s) URL of the paid endpoint | |
| method | No | HTTP method the endpoint expects (default GET) |
Tool Schema Changelog
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
1 tool update
- First observed
check_x402_endpoint
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Pay for HTTP APIs and charge for your own: x402 micropayments in USDC on Base.
Before you pay an x402 URL, ping it live or dead. One cent, USDC on Base.
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- FlicenseNot gradedqualityBmaintenanceEnables per-request paid AI analysis of public URLs, condition verification, and AI consultation via x402 micropayments on Base, with no account or subscription.7 npm-
- AlicenseNot gradedqualityCmaintenanceA one-command paywall for local servers that enables testing AI agents' payment flows by simulating HTTP 402 Payment Required responses. It proxies requests with valid payment headers to the actual server, making it easy to develop and test x402 client logic without real blockchain transactions.4 npmMIT
- AlicenseNot gradedqualityBmaintenanceEnables agents and IDE assistants to validate x402 payment endpoints without shelling out: it fetches a URL unpaid and returns a conformance report on the returned 402 challenge, decodes and classifies base64 payment blobs, and summarises which scheme/network pairs a facilitator can settle.MIT
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